Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Carlock, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
309-376 A CRLCILXDRS0  1015 FRONTIER NORTH, INC. - IL 366      
309-376 1   224C ONVOY, LLC 366   2019-07-14   
309-376 2   1015 FRONTIER NORTH, INC. - IL 366      
309-376 3   1015 FRONTIER NORTH, INC. - IL 366      
309-376 4   1015 FRONTIER NORTH, INC. - IL 366      
309-376 5   224C ONVOY, LLC 366   2020-05-21   
309-376 6   224C ONVOY, LLC 366   2019-01-17   
309-376 7   508J CENTURYLINK COMMUNICATIONS, LLC 366   2014-07-29   
309-376 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 366   2004-07-16   
309-376 9   224C ONVOY, LLC 366   2019-07-14   
309-812 A BLTNILTSYMD  495J STRATUS NETWORKS 366      
309-812 0   073H TELNYX LLC 366   2020-12-26   
309-812 1   495J STRATUS NETWORKS 366   2020-11-18   
309-812 2   224C ONVOY, LLC 366   2021-04-03   
309-812 3   624H ONVOY SPECTRUM, LLC 366   2023-06-02   
309-812 8   224C ONVOY, LLC 366   2021-02-12   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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